5" will barely cover my 69's opening leaving no room for the mounting hardware. That only leaves fiberglassing a new smaller opening to fit this cap. Not a viable option for my needs. I like the looks but not at the expense of butchering up my body. A flange of 5.75" would leave enough for the perimeter screws.

I got one a few years back from a place called Mustalgia or something like that. Mustang supplier but made these for the Vette. I think it was about $200 or so.

I found the guy that owns Mustalgia when I looked for one of these for my friend's '74. It was a very nice bolt in replacement for the stock lid.

It was designed to mount using the factory screws, and the stock screw on fuel lid fits inside the cap.

I don't remember the price though because I traded him a prepared Hydrobooster for his Corvette, but I do recall it was custom made specifically for Curt's year C3...and I think he offered them for all the different size lids that C3s used.

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